7040255 vs. 7040258
January 24th, 2009, 07:10 AM
#1
Registered User
Thread Starter
Join Date: Jan 2009
Posts: 323
7040255 vs. 7040258
I'm new to this but I wanted to check with the experts out there. Is there much performance difference between a W31 (7040255) carb versus a W30 (7040258) carb? Also, I thought an original W31 is the rarest oldsmobile carburetor. Is this true? Last, my friend says that a W30 (7040258) carb is worth more money. What do you guys say?
January 27th, 2009, 07:57 AM
#2
Registered User
Join Date: Mar 2007
Location: Tracy Ca
Posts: 1,568
The W31 carb use a smaller pri jet, # .057, and no pri rods. The 258 carb is a W30 auto, and it uses pri rods, so it has bigger jets .069. The W30 MT is like the W31 carb no pri rods. Both carbs are worth some money to the right person. The W30 MT carb #7040256, is probably the one worth the most money.
January 27th, 2009, 06:14 PM
#3
Registered User
Thread Starter
Join Date: Jan 2009
Posts: 323
Thanks for the information! I know there are a lot of fake carbs out there. I pickup an original 255 carb years ago but it is incorrect for my W30. Just still haven't located a 258 carb yet. I found someone who wants to trade but says that the W30 carb is worth more; so he wants the carb + $. But I just don't know if the 258 carb is real. You wouldn't happen to know a way to tell if a 258 carb is real ???
Last edited by virtualwsp; January 27th, 2009 at 06:16 PM.
January 28th, 2009, 01:27 PM
#4
"I reckon so!"
Join Date: Jan 2009
Location: The Mountain West
Posts: 365
Thanks for the information! I know there are a lot of fake carbs out there. I pickup an original 255 carb years ago but it is incorrect for my W30. Just still haven't located a 258 carb yet. I found someone who wants to trade but says that the W30 carb is worth more; so he wants the carb + $. But I just don't know if the 258 carb is real. You wouldn't happen to know a way to tell if a 258 carb is real ???
I sold my original 7029255 carb last summer for $500. It was probably worth more. The buyer was VERY happy with the deal.
January 28th, 2009, 02:19 PM
#5
Registered User
Join Date: Mar 2007
Location: Tracy Ca
Posts: 1,568
You can tell a lot of times if a carb has been restamped, unless it is a real good job. Also on the 255 carb, take it apart and see if it has pri mettering rods. Even if it was restamped, I would bet they did not change the inside, as most guys probably don't even know they are different inside.
February 4th, 2009, 07:10 AM
#8
Banned
Join Date: Aug 2005
Location: columbus ohio
Posts: 1,132
February 4th, 2009, 08:41 PM
#9
Registered User
Thread Starter
Join Date: Jan 2009
Posts: 323
Not sure if you can make a comparison between the 7049255 carb in 1969 to the 7040255 carb in 1970. Pricing is on different spectrums. I have one person who is willing to trade a spare 1970 ram air hood for the 7040255 carb. That is about a $2000 value. Personally, I don't think the carb (or a 7040258) is worth that much. I have one other person willing to swap my 0255 carb with an 0258 carb which is what I need.
February 22nd, 2019, 09:06 AM
#11
Registered User
Join Date: Sep 2013
Posts: 3
Thread
Thread Starter
Forum
Replies
Last Post
